Fix test workflow

.github/workflows/run-tests.yml

@@ -25,6 +25,12 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest flake8
+        pip install .
+
     - name: Check code style with flake8 (lint)
       run: |
         # warnings if there are Python syntax errors or undefined names 
@@ -33,12 +39,6 @@ jobs:
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install pytest
-        pip install .
-
     - name: Test with pytest
       run: pytest